Machine for opening trenches in paved streets.



PATENT@ JULY im 152m;

No.V 894,269.

A ';f. HBND'RUN. MACHINE FOR. OPENING TRENGHES 1N PMB@ STR-Bmx..

APPLIOATION. FLED AUG. 7, -1907.

No. 894,269. PATENTED JULY 28, 1908. J. IVI. HE\DBON.

MACHINE POR OPENING TRENCHES IN PAVED STREETS.

APPLIGATIUN FILED A UG. 7.1907A PATENTBD JULY 28, 2906.

J. M. HBNDNON, MAGHINB'FOR OPENING TNBNGHES IN PAVED STREETS,

APPLIGATIGN FILED AUG. 7.1907. 4 SHELTSSHEET 3.

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PATENTED JULY 28, 1908. J. HENDRON MACHINE PGB. OPENING TRENGH-Es IN FAVBD STREETS.

APPLIGATGN FILED AUG. '1.1907'.

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'Angeles STATES.v PATENT OFFICE. i.

` JAMEsM. HENDEON, or Los ANGELES, CALIFORNIA.

No. seance.

Tofall whom it 'may 'con-cern.-

Beit known that I, JAMES M. HENDRON, a citizen of the vUnited States; residing in Los county of Los Angeles, and State of California, 'have invented new and useful improvements in Machines for Opening Trenches in Paved Streets, of which the following is a specification.

My invention relates to a machine primax-ily designed for cuttingthe surface of an asphaltumpaved street preparatory -to diggingxa' trench for layingwater or other pipes in t e streetfvand thevobject thereof is to produce'a' machine that will cut through the asphaltum surfacing material so that the part kwhere the trench is to be dug may be removed ,without injury to the other parts of the pavement and also t'o cut or break the concrete foundation sc that .the same can be remet/edv without injury to the other parts of the pavement. 1 'I` accomplish this object byjthe machine described herein and illustraited 'in theaccompanying drawings in Figure 1 isa side elevation of my improved machine. Fig. 2 is a plan of the same with a part ofthe saw frame omitted. Fig. 3 is a bottom' plan of the mechanism shown in Fig. 2,4 with parts broken away for clearness of illustratn. Fig..4 is a frontend view of a portion of the mechanism. Figs. 5 and 6 are details of portionsof the mechanism,

: In the drawings is the .base frame which is preferably-rectangular in shape and is,

formed of suitable channel iron with proper cross and stay braces. Atthe front of the frameis the frontitruck 11 which supports the front end of lthe machine. To this truck is secured the steeringpost 12 on the top of which' is affixed the steeringY wheel 13 by means of which the direction of the machine is controlled when traveling. Near the rear end of the base frame .andrevolubly.mounted in suitable bearings is the rear axle 14 on the outer endsof which are secured the traction wheels 15 and 16.' These Awheels consist of an outer rim 1'7,'a-web 1S, and hub 19, and a gear rim and 20`` which is secured to the web intermediate the :hub and outer rim rllhe gear rim V20 of wheel 15 meshes with a pinion 21 loosely mounted on shaft 22, gear rim 20a of wheel'l meshes with pinion 23 which'is loosely mounted on the other end of shaft 22.- The linner ends of these pinions 211a'ndf'23 terminate iclutch members 24 and Specification of Letters Patent. Application led August 7, 1907. Serial No. 387,504.

y FOR OPENING TRENCHES AIN'PCAVEDVS'IIREEIIS.

Patented July 28, 1908.

-1s splined on shaft 22 and when thus engaged pinion 21. is locked to shaft 22 and rotates therewith. Clutch member 25 is adapted to be engaged byclutch member 27 which is splined on shaft 22 and when thus engaged pinion 23 is locked to shaft 22 and is rotated therewith. Secured to shaft 22 andpreferably in the center thereof is a sprocket wheel 28 on which is a sprocket chain 29, which passes over sprocket wheel 30 secured upon shaft 31. Shaft 3l is revolubly mounted in bearings 32 and 33 which are sectu'ed to the top frame 34. The front end of the top frame is secured to the front guide frames 35 and the rear end of the top frame is secured to the rear guide frame 36. The top frame is covered by aflooring 37 only shown in Fig. 1, being omitted in theother views for clearness of illustration. Upon this flooring and to the topframe is secured engine 38 which is provided with a driving shaft 39. This engine is preferably a gas or gasolene engine but any suitable make of engine can be used.

Upon the driving shaft' of the engine are fly wheels 40 and 40a, and sprocket wheels 41 and 42. Sprocket wheel 41 is connected by sprocket chain 43 with sprocket-wheel 44 which is rigidly mounted upon shaft 31, whereby when the engine is operating shaft 31 is rotated. In the front guide frames and vertically movable therein is the saw frame 45, in the bottom of which is mounted the saw shaft 46. On this shaft and splined thereto are saws 47 which can be adjusted at any desired distance apart on said shaft.

- These saws are designed to cut through the' asphaltum surface of an asphalt paved street, and are set as far apart as it is desired to have the asphalt surface cut at the top of the trench. In the; top of the saw frame is revolubly mounted the saw driving shaft 48 to which is secured sprocket wheel 4Q which is connected by sprocket chain 50 to sprocket wheel 5l mounted upon and secured to shaft 31. Sprocket chain 50 is kept taut by tight-ener .wheel 52 which is mount-ed in the end of pivoted lever 53 the other end of which is secured to the front guide frame. A spring 54 is connected to said lever and to the to frame as best shovm in Fig. 1 and hol s said tightener wheel in. engagementl with the sprocket l is carried by shaft 8M" A yoke 90 straddles wheel 88, and a shaft 91 is swlvelly Connected 4 wheel. On shaft 48 is also mounted pinion 55 which meshes'with idler gear 56, and Idler gear 56 meshes with the second idler I57, and idler 57 meshes with gear 58, which is mounted upon and secured to shaft 46. To the top of the saw frame and in threaded engagement therewith and at each side thereof are height regulating screws 59 and 60. These height regulating screws 59 and 60 are revolublymounted in the frontguide frames and one of said screws preferably 59 is provided with an operating wheel 61 by means of which the screws may be rotated. Screw 59 is provided with a sprocket wheel 62 and screw 60 is provided with a sprocket wheel 63 and these sprocket wheels are connected by chain 64 so that both screws may be operated together to raise or lower the saw frame, which is done to regulate the depth at'which the saws are to cut the surface of the pavement or to remove the same wholly above the surface thereof when moving the machine from point `to point.

InV 'the rear guide fralne and vertically movable therein is a hammer 65 which is rovided with one or more chisels 66 which break the surface of the concrete 67 when they are dropped thereon as hereafter explained. This hammer is guided in its vertical movement by T-shaped guides 68 which are rigidly secured in their upper portions to the rear guide frame. The lower portion of these guides are secured to the upper portions by hinged joints one of which 69 is shown in section in Fig. 6, and also P1ns70V shown in dotted lines in Fig. 1. and 71 are secured to the lower end of these TShaped guides and project through slots in the rear guide frame one of which slot 7 2 is shown in lFig. 1. Eye-bolts 7 3 and 74 are mounted on these pins and'passed through Suitable bearings in the frame and have secured upon. their inner end tension springs 75 'and 76 best shown in Fig. 2. This construction is provided so that the chisels can project rearwardly as shown in dotted hnes in dg. 1 as the machine is being o erated, whereby it is possible to operate tie hammer while the, machine is moving forward slowly and while the saws are operating slowly to cut the asphaltum surface 77. VOn shaft 31 is rigidly secured sprocket wheel 78 which is connected by sprocket chain 79 with sprocket wheel 80 rigidly secured upon shaft 81. On shaft 81 is also secured bevel gear 82 which meshes with bevel gear 83 secured upon shaft 84. Shaft 84 has secured thereto worm gear 85 which engages worm wheel 86 which worm wheel is rigidly secured upon shaft 87.

On shaft 87 is rigidly secured the supplementary traction wheel 8SM/Shaft 87 is revolubly mounted in the swing .frame 89 whlch i seaaee to said yoke. This shaft at its lower portlon is screw threaded and passes through a large nut 92 which is secured in a plate 93 which is secured to bearings 94 mounted on the top frame Nut 92 has collars at each end thereof one of which is screwed upon the body of the nut in order to permit the body of the nut to pass through plate 93. On the top of shaft 9,1 is an operating wheel not shown, by means of which. the supplementary traction wheel may be raised from contact with the surface of the street or be caused to engage the same and to sup ort the whole rear portion of the machine 1 desired. 1f desired the supplementary traction wheel 88 could. be omitted. If omitted the` driving speed of wheels 15 and 16 should be slow enough for the working speed of the machine, and additional sprocket wheels and chains would be provided with appropriate clutches togive axle 14 an appropriate s eed for moving the machine from place to p ace. A screvT 95 is used to lock the front truck against oscillation if desired.

In' the operation of my machine the saws will be regulated on shaft 46 the required distance apart and then secured against movement by set screws 94, the appropriate clutch will be thrown in to give the saws their required motion and the machine its forward motion. The saw frame will be fed down until th'saws cut vinto the surface of the pavement through the asphaltum surfacing to the concrete base. As soon as the machine has moved along a sufficient distance to bring the hammer overthe surface cut by the saws the hammer is set to work and the central ortion of the trench between the saw kers is broken by the hammer which is operated in the manner of deep well drilling riffs.

blt will be observed that the hammer is not as wide as the top of the trench, as it is only necessary that a ccntralstrip be broken by I machinery, andv that if the whole surface between the saw 'kerfs were broken' by the hammer there would be danger of injuring the parts adjacent to the trench. The cutting of the asphaltum surfacing by the saws does not injure any; of the adjacent part which is not to be removed and leaves a good edge for repair work, which is much superior to the present method of doing such work.

Having described my invention what l claim isz- 1. In a machine of .the character described herein the-combination of a base frame; travcling supporting means for said base frame;

-guide frames secured tos'said base frame near isc .mounted in said iront 'height with mounted onsaid shaft and adjustable there-` on; and mechanism to operate said shaft.

2. In a machine of the character described herem, the combination of a base frame;

.traveling supporting means` for'said base saw frame;- circular saws mounted on said shaft and adjustable thereon; and mechanherein,

ism to operatesaid shaft.

3. In a machine' of the character described the combination ofa base frame; traveling supporting means for said base frame; guide frames secured to said vvbase fra-me near the `front thereof; a vertically movable sa guide fra-mes; adjustable circular saws revolcured to said base frame;

ubly mounted in' said sawframe mechanism to operate said saws; a rear guide framese- `a' vertically mov- V in said rear guide frame; a chisel secured in said hammer; and mechanism for operating said hammer, j 4. In a machine of the character described herein, the' combination of a base raine; a rear driving truck secured to said base frame; a front guiding truck secured to the 4front of said base frame; mechanism for driving said rear-truck in either direction; hians for guiding said front truck; guide frames secured to sald base frame near the front. thereof; a saw frame mounted-in said front guide'frames; means to vertically adjustl said saw frame in said guide frames; adjustable circular saws revolubly mounted in said saw frame; mech- 4anism to operate said saws; a rear guide frame secured to said base frame a vertically movable hammer mounted m sald rear guide guide.

W frame mounted. in said front' '.'frame mounted 1n saldv front frame; a chisel secured in said hammer; and mechanism for operating said hammer.

.5. In a machine of t-he character described herein, a base frame; a rear guide frame secured to said base frame, said guide frame having the low'er portion thereof pivotally 4connectedto the upper portion, said lower portion bein held spring pressed in vertical alinement wlth the upper portion; a verticall movable hammer mounted in said rear gui( e frame; a chisel removably secured in said hammer; and mechanism for operating said hammer. 1- A 6. In a machineof the character described herein, the combination of a base frame; a reardriving truck secured to said base frame; mechanism for drivin@r saidV rear .truck vin either direction; a guiding truck secured to the front of said base frame; means for operating said truck; guide frames secured to said base frame near the front thereof; a saw guide frames; means to'vertically adjust said saw frame in said guide frames; adjustable circular saws revolubly mounted in said saw frame mechanism to operate said saws a rear guide frame secured to said base frame; said rear guide frame having the lower port-ion ther-jeoilpivotally connected to the upper port ion,s`ai lower portion being held spring pressed in vertical alinement'with the upper portion; a vertically movable hammer mounted in said rear guide frame; a chisel removably secured in said hammer; and mechanism for operating said hammer.

In Witnessthat I claim the foregoing I have hereunto subscribed my name this 1st' day of August, 1907.`

G. E. HARPHAM, S. B. AUSTIN. 

